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Significant accounting policies - Cost of Increase of Share in Controlled Companies (Details) - ARS ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Apr. 30, 2017 | Dec. 31, 2017
Business combination |  |  |  |
Increase (decrease) through changes in ownership interests | [1] |  |  | $ (3)
Personal |  |  |  |
Business combination |  |  |  |
Number of Shares Acquired |  | 120,000 |  |
Proportion of voting rights held by non-controlling interests |  | 0.008% |  |
Total purchase price |  |  | $ 4 |
Ownership percentage by parent |  |  | 100.00% |
Increase (decrease) through changes in ownership interests |  |  |  | $ 3
[1] | See Note 3.u.

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- Definition The increase (decrease) in equity attributable to owners of the parent through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]; Equity attributable to owners of parent] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 18 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_18&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_d&doctype=Standard -URIDate 2017-03-09 + Details
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